Synchronous electric motor structure



Sept. 5, 1939. A B, POOLE 2,171,989

sYNcHRoNoUs ELECTRIC MOTOR STRUGTURE` Original Filed Dec. 5, 1957 ity present disclosure, thisr invention Patented Sept. 5, 1939 PATENT ,OFFICE SYNCHRONOUS ELECTRIC MOTOR STRUCTURE Arthur B. Poole, Bristol, Conn., assigner to The E. m Company, Bristol, Conn., a corporation of Connecticut Original application December 3, 1937, Serial N0.

Divided and this application April 29,

1938, Serial No. 204,933

1o claims.

'I'his invention relates to an improvement in synchronous electric motor structures, and more especially to an improvement in synchronous-electric motor-structures of the character employed in the propulsion of clocks and other time-instruments; .and constitutes a division of my co-pending application Serial No. 177,839, iiled December 3, 1937.

'One of the objects of the present invention is to provide a superior synchronous-electric motorstructure having an improved construction and arrangement of parts, whereby current may be supplied to the energizing-coil associated with a eld-structure sealed Withina substantially oiltight casing.

Another object of the present invention is to' provide a superior synchronous-electric motorstructure of the type having an enclosed energizing-coil, with a superior construction and arrangement of terminal-ttings through which electric current maybe energizing-coil with an enclosed held-structure. I

With the above and other objects in view, as will appearv to those skilled in the art from the includes all features inthe said disclosure which are novel over the prior art and'which are not claimed in any 'separate application.

In the accompanying drawing, in which a preferred embodiment of the invention is shown for illustrative purposes;

Fig. 1 is a view in front-end elevation ofa synchronous-electric motor-structure embodying the present invention;

Fig. 2 is a view thereof in side elevation;

Fig. 3 is a view of the motor-structure shown in axial sectionv and taken on the line 3 3 of Fig. 1,'

lFig. 4 is a fragmentary section taken on the line 4 4 of Fig. 2, one of the terminal-iitting units being shown in side elevation;

Fig. 5 is a perspective view of an outer bushing detached from one of the terminal-assemblies:

Fig. 6 is a perspective view of oneof the insulator-bushings detached; and

Fig. 7 is a similar perspective view of one of the terminal-receiving bushings detached.

According to the illustrative embodiment of the present invention shown on the drawing, a cupsliaped pole-unit is employed which constitutes a part oi' a hollow field-structure and comprises a relatively-deep outer cup-shaped member I and a relatively-shallow cup-shaped inner member Ii tightly iltted withinthe said outer member l0. The said cup-shaped pole-unit is constructed to supplied to the enclosed pole-unit comprising an outer disk I2 and an inner disk I3; the said disk-like pole-unit being iitted within the open end of the outer cup-shaped member I0 of the cup-shaped pole-unit to bear against the outer 'edge of the ,5 inner cup-shaped member II of the said cup- .shaped pole-unit, 'as shown in Fig. 3. 'Ihe outer and inner cup-shaped members I Il and Il comprising the cup-shaped4 pole-unit and the inner and outer disks I2 and I3 comprising the disk-like pole-unit, are composed of suitable magnetic material, such, steel, or the like.

For the purpose of rigidly securing the diske pole-unit in position within the outer cupshaped member I0, the periphery of the said outer member I0 of the cup-shaped pole-unit may be indented at spaced intervals as at it (Fig. 3) to displace metal over the rear face of `the outer member I2 of the disk-like pole-unit.

Projecting rearwardly from the end-wallv of the cup-shaped pole-unit is a circular series of bar-like salient poles i formed of suitable magnetic material and arranged in alternation with a circular series of bar-like salient poles i8 which are presented oppositely thereto from the receive a disk-like disk-like pole-unit in the manner fully described in the above-identified co-pending application. Shading- I l and 4I8 formed of copper or other suitable high electro-conductive material, and having the form and construction fully described in said co-pending application, are shown. in Fig. 3. The said shading-,disks are constructed and arranged to produce a rotating-held effect.

Extending around the exterior of the circular series of salient poles I5 and I6 within the cupshaped pole-unit and forming apart of the fieldenergizing system of the synchronous motor, is a ring-like energizing-coil I9 from the rear face of which respectively adjacent the inner and outer peripheries, insulated terminal-wires `and 2i extend transversely .through a radial slot I83L in the shading-disk I8.

Centrally arranged with respect to the annular series of salient poles I5 and I6, is a rotor-unit which, as explained in the above-identified copending application, preferably comprises a rotor-hub 22 constructed of brass pair oi' corresponding but oppostely-facing cupshaped rotor-elements 23-23 which are preferably iormed oi permanent magnet steel or its equivalent and spaced from each other by a salient-'pole rotor-element 24 -which may be eon- 65 or the like, a

veniently made of soft iron or other non-permanent magnetic material.

The rotor-hub 22 of the rotor-#elements 23 and 24 is mounted with freedom for relative rotation upon an arbor 25 and carries a pinion 26. The said pinion being the flrst member of a reducing gear-train including a compound gear 2l28, compound gear 29-430, and a driven gear (not shown) which is secured to a power-output shaft (not shown).

All of the above-described parts are enclosed Within an oil-retaining housing comprising a relatively-deepv cup-shaped housing-member 3| and a anged cap-member 32 which latter fits over the cylindrical wall of the cup-shaped housingmember 3|. The construction and arrangement of the housing, as it is described in the copending application identied herein, is such, that oil may be introduced and retained in the housing and it may move substantially-freely about the interior of the housing and about the said parts mounted therein. Sealing arrangements are also provided for the housing to prevent escape of the oil therefrom and as part of these provisions the cap-member 32 is preferably soldered or otherwise sealed to the cup-shaped member 3| to provide substantially oil-tight housing.

As assemblies of improved construction, comprising terminal-ttings, are mounted in the cylindrical Wall of the'relatively-deep cup-shaped housingmember 3| arid pass therethrough into a portion of the housing in which oil is held. The said terminal-assemblies being preferably identical in construction, a description of onewill serve for both in the present embodiment of the invention. In theform shown in detail in Figs. 4, 5. 6, and 7, each of the terminal-assemblies comprises an outer bushing 33, an inner bushing 34, and an intermediate bushing 35, all of said bushings being constructed of suitable materials for their respective purposes to be presently described.

The outer bushing 33 ls preferably formed of brass or other metal which may be conveniently soldered to the adjacent portion of the periphery of the cup-shaped housingfmember 3|, and has its majorI portion extended into the interior of the said housing-member to a degree sufficient to bring an annular flange 33 at its outer end into seating engagement with the outer surface of the said housing-member 3|, as is particularly well shown in Fig. 4.

Tightly fitting into the 'axial passage in the outer bushing 33 is the intermediate bushing 35 which is preferably composed entirely of insulating material such, for instance, as Bakelite, indurated fiber, etc. The said intermediate bushing is preferably constructed so as to have a relatively-long inner stem 35a, a relatively-short intermediate neck 35, and a head or ange-portion 35. The inner face of the neck 35b of the bushing 35 is preferably firmly seated against the outer faceof the outer bushing 33,'as shown.

The inner bushing 34, abovereferred to, may be aptly termed a terminal-wire-receiving sleeve or bushing, and is preferably formed of brass or othersuitable readily-solderable electroconductive4 material, and includes a relatively-long tubular shank which nts tightly into the axial passage in the intermediatel bushing 35 and is also provided at its outer end with a head-portion 34B which seats against the outer face of the flange 35c of the said intermediate bushing.

The bare outer portion of either the terminal- Vwire 20 or the terminal-wire 2|, as the casel may shown in Figs, 1 and 4, two terminalbe, is passed outwardly through the axial passage in the inner bushing-34, and is preferably deected laterally so as to lie in close proximity to the outer face of thesaid inner bushing.

After the bared portions of the terminal-'wires 20 and 2| have been threaded outwardly through? their respective inner bushings 34, the bared ends of supply-wires 36 and 3l respectively may be soldered thereto as at 38. not only results in the direct interconnectionof the wires 2li-36 and 2|-3`|, but also anchors all of the said wires directly to their respective inner bushings 34. Furthermore, the solder at 38 serves to seal the'axial passage through both of the inner bushings and thus guards against the outer leakage of-oil from Within thecasing provided by the members 3| and 32.

- Thus, by means of the construction and arrangement of parts above described, a simple, reliable and effective electrical connection is provided between the terminal-wires of the energizing-coil I9 and external supply-wires such, for instance, as 36 and 3l. The connections thus provided are not only electrically eiective', but are alsoof great mechanical strength, so that stresses applied to the vexterior supply-Wires 35 and 31 are effectively resisted without interrupting the electrical connection.

The invention may be carried out in other sp'ecinc ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in`all re spects as illustrative 'and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

1. A synchronous-electric motor-structure including in combination: an oil-retaining housing; a field-structure enclosed within the said housing; anenergizing-coil also enclosed within the 1 said housing in position to apply magnetic-flux to the said iield-structure; a rotor also enclosed within the said. housing and positioned to be synchronously rotated by the magnetic-flux applied to the said field-structure by the said energizing-coil; a plurality of terminals mounted in the said housing, and each having a passage extending therethrough from the interior to the exterior of thesaid housing; a plurality of terminal-wires connected to the said energizing-coil,

The said solderingl each of said terminal-wires 'leading from the j said energizing-coil outwardly through the passage in one `of said terminals to the exterior of the said housing; the said housing being constructed and arranged for substantially-free movement of oil within its interior and about all of the said parts mounted therein; and the said housing being also substantially-sealed against escape of oil, each of the said terminals being mounted in fluid-tight relation to the housing, and the sealing arrangements also including a sealing-body secured to each of the' terminals and about the terminal-wire passing therethrough, to close and oil-tightly seal the passageA in each of the terminals, and to anchor vone of the terminal-wires to each of the said terminals.

2. A synchronous-electric motor-structure including in combination: an oil-retaining housing; a field-structure enclosed within the said housing; an energizing-coil also enclosed within the said housing in position to apply magnetic-flux to the said field-structure; a rotor also enclosed within the said housing and positioned to be Cil synchronously rotated by the magnetic-dax applied to the said field-structure by the said energizing-coil; a plurality of terminals mounted in the said housing, and each havingy a passage extending therethrough from the interior to the exterior of the said housing; a plurality of terminal-wires connected to the said energizingcoil, each of said terminal-wires leading from the said energizing-coil outwardly through the passage in one oisaid terminals to the exterior of the said housing; an electric supply-wire leading to the outer end of each of the said terminals. the said housing being constructed and arranged for substantially-free movement of oil within its interior and about all of the said parts mounted therein; and the said housing being also substantially-sealed against escape of oil, each of the said terminals being mounted in uid-tight relation to the housing, and having its outer endportion composed of solder-receptive material, and the sealing arrangements also including bonds of solder each uniting one of the terminalswires with one of the supply-wires and jointly anchoring the same to the solder-receptive outer end-portion of one of the terminals, one of the said bonds of solder closing and oil-tightly sealing the passage in each of the said terminals.

3. A synchronous-electric motor-structure in` cluding in combination: an oil-retaining housing; a field-structure enclosed within the said housing; an energizing-coil also enclosed within the said housing in position to apply magnetic-flux to the saideld-structure; a rotor also enclosed within the said housing and positioned to be synchronously rotated by the magnetic-ilux applied to the said field-structure by the said energizingcoil; a plurality of terminals mounted in the said housing, each of said terminals including a bushinghaving a passage extending therethrough from the interior to the exterior of the said housing; a plurality of ,terminal-wires connected to the said energizing-coil, each of said terminalwires leading from the said energizing-coil outwardly through the passage in one oithe said bushings to the youter end-portion of that bushing; a plurality of electric-'supply wires respectively leading to the outerfend-portions of the said bushings; the said housing being constructed and arranged for substantially-free movement of oil within its interior and about all of the said parts mounted therein; and the said housing beingalso substantially-sealed against escape of oil,- each of the said terminals being mounted in iluid-tightrelation to the housing, and the bushing of each terminal having its outer end portion composed of solder-receptive material, and the sealing arrangements also including bonds of solder each permanently uniting one' of the terminal-wires with one of the supply-wires and jointly permanently anchoring the same to the solder-receptive outer end-portion of one of the said bushings, one of the said bonds of solder closing and oil-tightly sealing the passage in the bushing of each of the said terminals.

4. A synchronous-electric motor-structure including in combination: an oil-retaining housing; a held-structure enclosed within the said housing; an energizing-coil also enclosed wlthin'the said housing in position to apply magnetic-flux to the said field-structure; a rotor also enclosed within the said housing and positioned to be synchronously rotated by the magnetic-flux applied to the said field-structure by the said energizing-coil; a `plurality of terminal-assemblies mounted in the said housing and each having a passage extending therethrough to provide communication between the interior and the exterior of the said housing; a plurality of terminal-wires connected to the said energizing-coil leading therefrom outwardly respectively through the passage in one of the said terminal-assemblies to the exterior of the said housing the said housing being constructed and arranged for substantiallytree movement of oil within its interior and about all of the said parts mounted therein; and the said housing being also substantially-sealed against escape of oil, each of the said terminals being mounted in iluid-tight relation to the housing, the sealing arrangements including a member of each of the said terminal-assemblies arranged in uid-tight relation. to the said housing, and also including a sealing-body secured to another member of each of the terminal-assemblies and about the terminal-wire passing therethrough, to close and oil-tightly seal the passage in the said terminal-assembly and to anchor one of the terminal-wires to each oi' the said terminalassemblies.

5. A synchronous-electric motor-structure including, in combination: an oil-retaining housing/a field-structure enclosed within the said housing; an energizing-coil also enclosed within the said housing in position to apply magneticflux to the said field-structure; a rotor also enclosed within the said housing and positioned to be synchronously rotated by the magneticflux applied to the said held-structure by the said energizing-coil; a plurality semblies mounted in the said housing and each having a passage extending therethrough to provide communication between the interior and the exterior of the said housing; a plurality of terminal-wires connected to the said energizingcoil leading therefrom outwardly respectively through the passage in one of the said terminalassemblies to the exterior of the said housing; -the said housing being constructed and arranged for substantially-free movement ot oil within its interior and about all of the said parts mounted therein; and the'said housing being also substantially-sealed against escape of oil, each oi' the said terminals being mounted in huid-tight relation to the housing, the sealing arrangements including an insulator-bushing of each terminalassembly oil-tightly tted about the outer wall of an inner bushing of each terminal-assembly and means supporting the insulator-bushing of each terminal-assembly and having fluid-tight relation to the said housing, the said sealing arrangements also including a sealing-body secured to the inner bushing of each terminalassembly adjacent the exterior end thereof and to the terminal-wire passing through the said inner bushing, to close and oil-tightly seal the passage in the said inner bushing and to anchor one oir` the terminal-wires to the inner bushing of each of the said terminal-assemblies.

6. A synchronous-electric motor-structure including in combination: an oil-retaining housing; a held-structure enclosed within the said housing; an energizing-coil also enclosed within the said housing in position to apply magneticux to the said field-structure; a rotor also enclosed within the said housing and positioned to be synchronously rotated by the magnetic-flux applied to the said held-structure by the said energizing-coil; a plurality of terminal-assemblies mounted in the said housing and each having a passage extending therethroughto provide communication between the interior and the exof terminal-as-- lso terlor of the said housing; a plurality of terminalp wires connected to the said energizing-coil leadstantially-sealed against escape of oil, each of said terminal-assemblies comprising an outer bushing mounted in an opening formed in the wall of said housing and forming therewith an oil-tight seal around the edge of the said opening; an insulator-bushing mounted within and forming an oil-seal with the'said outer bushing;

and an inner bushing, through which one of the said terminal-wires extends, mounted within and forming an oil-tight seal with the inner wall of said insulator-bushing, said inner bushing being constructed of metal at its outer end; a plurality of electric supply-Wires respectively leading to the metallic outer ends of the said inner bushings; and the sealing arrangements also including bonds of solder each uniting one of the terminal-wires with one ofthe supply-wires and jointly anchoring the same to thev metallic outer end of one of 'the inner bushings, one of the said bonds of solder closing and oil-tightly sealing the passage inthe inner bushing of each of the said terminal-assemblies.

7. A synchronous-electric motor-structure including in combination: an oil-retaining housing; a eld-structure enclosed within the said housing; an energizing-coil also enclosed within the said housing in position to apply magneticux to the said eld-structure; a rotor also enclosed within the said housing and positioned to be synchronously rotated by the magnetic-iiux applied to the said field-structure by the saidA energizing-coil; a plurality of terminal-assemblies mounted in the said housing and each having a passage extending therethrough to provide communication between the interior and the exterior of the said housing; the said housing being constructed and arranged for substantiallyfree movement of oil within its interior and about all of the said parts mounted therein; and the said housing being also substantially-sealed against escape of oil, each of the said terminalassemblies comprisingl an outer bushingfmounted in an opening formed in the'wall of said housing, the said outer bushing being provided with a flange in abutment with the housing-wall around the edges of said opening and soldered to the said housing-wall to provide an oil-tight joint therebetween; an insulator-bushingmounted in and forming an oil-tight seal with the said outer bushing; and an inner bushing constructed of metal mounted in and forming an oil-tight seal with said insulator-bushing; a plurality of terminal-wires connected to the said energizingcoil, the said terminal-wires leading from the said energizing-coil outwardly through the said inner bushings respectively to the outer ends thereof; a plurality of electric-supply wires respectively leading to the outer ends of the said inner bushings; and the sealing-arrangements also including bonds of solder each uniting one of the terminal-wires with one of the supply-d wires and jointly anchoring the same to the metallic outer endof one of the inner bushings, one

of the said bonds of solder closing and oil-tightly sealing the passage in the inner bushing of each of the said terminal-assemblies.

8. A synchronous-electric motor-structure including in combination: an oil-retaining housing; a field-structure enclosed with the said housing; an energizing-coil also enclosed within the said housing in position to apply magneticflux to the said field-structure; a rotor also enclosed within the said housing and positioned to be synchronously rotated by the magnetic-flux applied to the said field-structure by the said energizing-coil; a plurality of terminal-assemblies mounted in the said housing and veach having a passage extending therethrough to provide communication between the interior and the exterior of the said housing; the lsaid housing i being constructed and arranged for substantiallyfree movement of oil within its interior and about all of the said parts mounted therein; and the said housing being also substantially-sealed against escape of oil, each of said terminal-assemblies comprising a metallic outer bushing mounted in the housing in uid-tight relation thereto; an insulating-bushing projecting outwardly and inwardly beyond the outer and inner ends respectively of said outer bushing; and an inner metallic bushing projecting outwardly 'beyond the outer end of said insulating-bushing and terminating at its inner end within said insulating-bushing; an electric-supply wire leading to the outer end of each inner bushing; and the sealing-arrangements also including bonds of solder each uniting one of the terminal-wires with one of the supply-wires and jointly anchoring the same to the metallic outer end of one of the inner bushings, one f the said bonds of solder closing and oil-tightly sealing the passage in the inner bushing of each of the said terminalassemblies.

9. A synchronous-electric motor-structure including in combination: an oil-retaining housing; a hollow field-structure enclosed Within the said housing and having an end-wall adjacent to and spaced laterally from the end-wall of said housing; an energizing-coil mounted within the hollow held-structure to apply magnetic-iux thereto; a rotor positioned to be synchronously rotated by the magnetic-flux applied to the -said held-structure by the said energizing-coil; a plurality of terminals mounted in the said housing between the said end-wall of the housing and the end-wall of the hollow field-structure adjacent thereto; each of said terminals having and arranged for substantially-free movement of oil within its interior and about all of the said parts mounted therein; and the said housing being also substantially-sealed against escape of oil, each of the said terminals being mounted in fluid-tight relation to the housing, and th sealing arrangements also including a sealingbody secured to each terminal and uniting the the supply-wires and jointly anchoring the same to the terminal, each sealing-body closing and oil-tightly sealing the passage in one of the said` terminals.

, 70 terminal-Wire passing therethrough with one of 10. 'A synchnonous-electric motor-structure for substantially-free movement ofoil Within its including in combination: an oil-retaining housinterior and about all of the said parts mounted ing; a. field-structure enclosed within the said therein; and the said housing being also subhousng; an energizing-coil also enclosed within stantially-sealed against escape of oil,y each of the said housing to apply magnetic-mix to the the said terminals being mounted in iluid-tight said field-structure; a rotor positioned within relation to the housing,`and the sealing arrange the said housing to be synchronously rotated by ments also including means permanently secured the magnetic-flux applied to the said field-structo the terminal at the outer end thereof and also ture; a terminal mounted in the said housing and permanently secured about the terminal-wire having a passage extending from the interior to passing therethrough, to permanently close and the exterior of the said housing; aterminal-wire oil-tightly seal the passage in the said terminal leading from the said energizing-coil through the and to rigidly unite the terminal-wire to the said passage to the exterior of the said housing; said terminal.

the said housing being constructed and arranged ARTHUR, B. POOLE. 

